A high-power femtosecond Yb:fiber amplifier operating with exceptional noise performance and long-term stability is demonstrated. It generates a 10-MHz train of 145-fs pulses at 1.03 μm with peak powers above 36 MW. The system features a relative amplitude noise of 1.5⋅10−6 Hz−1/2 at 1 MHz and drifts of the 60-W average power below 0.3% over 72 hours of continuous operation. The passively phase-stable Er:fiber seed system provides ultrabroadband pulses that are synchronized at a repetition rate of 40 MHz. This combination aims at new schemes for sensitive experiments in ultrafast scientific applications.

A high-power femtosecond Yb:fiber amplifier operating with exceptional noise performance and long-term stability is demonstrated. It generates a 10-MHz train of 145-fs pulses at 1.03 μm with peak powers above 36 MW. The system features a relative amplitude noise of 1.5⋅10<sup>−6</sup> Hz<sup>−1/2</sup> at 1 MHz and drifts of the 60-W average power below 0.3% over 72 hours of continuous operation. The passively phase-stable Er:fiber seed system provides ultrabroadband pulses that are synchronized at a repetition rate of 40 MHz. This combination aims at new schemes for sensitive experiments in ultrafast scientific applications.terms-of-use2015-05-21T07:21:27ZLeitenstorfer, AlfredStorz, Patrick2015engUltrastable fiber amplifier delivering 145-fs pulses with 6-μJ energy at 10-MHz repetition rateWunram, MarcelBrida, DanieleBrida, DanieleStorz, Patrick2015-05-21T07:21:27ZLeitenstorfer, AlfredWunram, Marcel